Shuttle for electronic loom protection



May 1, 1951 v. F. SEPAVICH SHUTTLE FOR ELECTRONIC LOOM PROTECTION FiledDec. 6, 1949 II I T W b ATTORNEY.

Patented May 1, 1951 UNITED STATES PATENT OFFICE SHUTTLE FOR ELECTRONICLOOM PROTECTION Victor F. Sepavich, Worcester, Mass., assignor toCrompton & Knowles Loom Works, Worcester, Mass., a corporation ofMassachusetts Application December 6, 1949, Serial No. 131,378

Claims. (Cl. 139-203) This invention relates to improvements in shuttlesadaptable more particularly for use with electric protection means forlooms and it is the general object of the invention to provide a shuttlehaving a magnetizable body embedded therein in such manner that itcannot engage the Warp threads of the loom.

In co-pending application Serial No. 81,164 filed March 12, 1949, byHowe and Sepavich there is set forth a form of electric protectionemploying an electronic circuit controlled by impulses generated in acoil on the lay as the shuttle passes over the coil. If the shuttle isrunning properly and on time the impulse will be generated at a point inthe loom cycle which will permit continued loom operation, but if theshuttle is running behind its correct time the impulse will be generatedtoo late in the cycle and the loom will be stopped.

The shuttle set forth in the aforesaid application has secured to theunderside thereof a body of magnetizable material, such as iron or softsteel, but in such position that some wearing of the threads of thebottom warp shed is likely to occur. It is an important object of thepresent invention to provide at least the bottom of the shuttle with acoating of hard fiber or the like and embed the magnetizable sheet orstrip between this coating and the wood of the shuttle. In this way themagnetizable sheet is prevented from ever having contact with the warpthreads.

It is a further object of the invention to provide either the body ofthe shuttle or the fiber base with a recess to receive one or more ofthe aforesaid strips of magnetizable material and hold them in fixedposition without requiring the use of screws or other fastening meanswhich might work loose and rip or break out the threads of the bottomshed.

With these and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts hereinafter described and set forth.

In the accompanying drawings, wherein a convenient embodiment of theinvention is set forth,

Fig. 1 is a diagrammatic front elevation of part of a loom showing a layprovided with an electric coil and showing two shuttles made accordingto the present invention,

Fig. 2 is a front elevation of one of the shuttles shown in Fig. 1having the invention applied thereto,

Fig. 3 is an enlarged transverse vertical section on line 3--3, Fig. 2,

Fig. 4 is a fragmentary longitudinal vertical section on line 4-4, Fig.3,

Fig. 5 is a detailed horizontal section on line 5-5, Fig. 4, and

Fig. 6 is a diagrammatic view showing the Warp sheds, the shuttle madeaccording to the present invention, and the lay. 2

Referring particularly to Fig. 1, the loom lay H! is supported on swordsH and has a shuttle box IE at one end and upper and lower shuttle boxes13 and Id at the other end, the latter boxes being shiftable by means ofa box lifter rod l5 so that either of the shuttle boxes may be moved toactive position. The loom is provided with the usual reed I6 and handrail I1 and the lay has a shuttle race l8 along which the shuttletravels when in flight across the loom. Carried by the lay below therace plate is a permanent magnet 59 wrapped with a wire coil 20 in whichan electric impulse is generated when a magnetizable body passes alongthe race plate over the magnet. The impulse energizes a signal system(notshown) indicating shuttle presence and forming part of a protectionmeans for the loom.

The shuttles SI and S2 for the shuttle boxes 13 and I6, respectively,are the same and a description of one of them will suffice for both.

As shown in Fig. 2, the shuttle SI is made from a wood blank and has abody member '25 with front and back walls 26 and 21, respectively, and abottom 28. The ends of the shuttle body are pointed in usual manner andare provided with shuttle tips 29. The shuttle is provided with a bobbincavity 3!! to receive a bobbin B which may be held to the shuttle in anyapproved manner and have the Weft W thereof led through a delivery eye3! in the front wall 26. The ends of the wood body 25 of the shuttle maybe solid, as indicated at 32 and 33, Fig. 2.

The shuttle thus far described is of common construction and may forinstance be of the type ordinarily used on felt looms, but the inventionis not necessarily limited to the type of shuttle body set forth hereinand the shuttle shown is merely illustrative. Furthermore, the shuttleforming the subject matter of the present invention is not necessarilylimited to the shuttle box the bottom of the wood part of the shuttle isrecessed as at 31 and has located therein two metallic plates 38 and 39which are preferably of magnetic material, such as iron or steel. Therecess 31 is shallow and of a depth just sufficient to receive theplates 38 and 39, and the latter fit the recess to be held thereinagainst relative movement with respect to the shuttle. The fiber plate35 extends under the plates 38 and 39 and confines the latter in therecess :31! and in effect embeds the magnetizable plates or stripswithin the shuttle.

The invention as already mentioned is used in connection with electricprotection .means controlled by the coil which is located along the layat a point between shuttle box 312 Zand the shuttle boxes 13 and [4. Thecoil and magnet are preferably under the bottom warp she'd BS, see Fig.6. When the shuttle passes over the magnet the magnetizable body on theshuttle causes an electric impulse to be generated in the coil which isutilized to control the grid of an electronic tube not shown herein butfully described and set forth in the aforesaid copending application.The relative position of the coil and the magnetizable body on theshuttle is set forth diagrammatically in Fig. -6, but it is to beunderstood that the invention is not necessarily limited to the locationof the magnetizable plates 38 and 39 centrally of the shuttle in atransverse direction as shown for instance in Fig. 3. The magnetizablebody on the shuttle should preferably be long-enough to bridge the poles'15 and 4! of the ermanent magnet.

I-f 'desired a single strip or body of magnetizable-materialcan beutilized, but I prefer to have at-least two plates which-may preferablybe made of thesame material-as that employed for electric transformers,the plates being suitably covered to insulate them from each other toprevent or at least reduce eddy currents as the shuttle passes over themagnet l 9.

From the foregoing it will be seen that the invention sets forth ashuttle having magnetizable material embedded therein and locatedpreferably between the non-magnetizable wood body of the-shuttle and ahard non-magnetizable wear- =ing base 135-madeof some such material asfiber. This base effectively prevents the magnetizable body-from everhaving contact with the threads of the bottom shed BS and cooperateswith the bodyof the shuttle to hold the plates 38 and 39 in fixedposition on the shuttle. The base will be relatively thin so that themagnetizable plates will not be located too far above the magnet l9 togenerate the needed impulse in thecoil 20. It will further be seen thatthe base 35 enables the magnetizable strips to be held in positionwithout the use of tacks, screws or other form of attachment which mightwork loose as the shuttle is picked back and forth across the loom.

Having thus described the invention it will be seen that changes andmodifications of the foregoing specific disclosure may be made withoutdeparting from the spirit and scope of the invention.

What is claimed as new is:

1. Ina shuttle for a loom lay having a magnet and coil forming part of asignal system, a shuttle body made of non-magnetizable material, a basemade of non-magnetizable material extending continuously along andsecured to the bottom of the shuttle body, and a mass of magnetizablematerial between said body and base.

2. In a shuttle for a loom lay having a magnet andcoil forming part of asignal system, a shuttle body member formed of non-magnetizablematerial, a base member secured to and extending 'along'the bottom ofthe body member, one of said members having a recess formed therein, anda mass of magnetizable material located in said recess betweensaidmembers.

-3. In a shuttle for a loom lay having a magnet and coil forming part ofa signal system, a shuttle body made of non-magnetizable material, asmooth uninterrupted base extending along the bottom of the body, and amass of magnetizable material located between the body and base andentirely inclosed within the shuttle.

4. In a shuttle for a loom lay having a magnet and coil forming part-ofa signal system, a shuttle bod-y formed of wood, a hard fiber basesecured to and extending along the bottom of the body, anda mass ofmagnetizable material between the wood.bodyand the fiber base.

5. In ashuttle fora loom lay having a magnet .and coil forming part of asignal system, a shuttle body member formed of non-magnetizablematerial, a base member formed of non-magnetizable material extendingalong and secured to the underside of the body member, one of saidmembers having -a recess formed therein, and a mass of magnetizablematerial located in and fitted snugly into said recess and held inposition between=and by cooperation of said members.

VICTOR F. SEPAVICH.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 514,232 .Kobertz Feb. 6, 18941,368,975 Shambow Feb. 15, 1921 2,172,336 Turner Sept. 5, 1939 FOREIGNPATENTS Number Country Date 181,712 Germany Mar. 16, 1907

